Apparatus for smoothing furnace walls



Feb. 12, 1946. c. R, JEFFREYS APPARATUS FOR SMOOTHING FURNACE WALLS Filed Dec 9, 1942 3 Sheets-Sheet 1 INVENTOR c. R. JEFFREYS APPARATUS FOR SMOOTHING FURNACE WALLS Feb. 12, 1946.

Filed Dec. 9, 1942 3 Sheets-Shet 2 INVENTOR 04431.5; 12. JEF'FE ya,

r. 1.4/ (f ATTORI Y Patented Feb. 12, 1946 IUNITEDYSTATES PAT EN'l OFFICE Charles R. Jeffreys, McKeesport, Pa. 7 Application December 9, 1942, Serial No. 468,401 .2 Claims. (01. 51-170) This invention relates to apparatus for smoothing hot furnace walls.

It is often desirable to repair or smooth hot furnace walls, such as those of the coking chambers of by-product coke ovens. A plurality of these chambers are arranged side by side with heating chambers between them. Each cokin chamber is approximately twenty inches on the discharge end and a few inches narrower on the pusher end. As the coke is pushed from the oven it tends to dig into the walls and pockets are gradually formed therein. Since the ovens are very close together, it is impossible to cool an oven down to a temperature at which a man could work while operating the adjacent oven. It has also been discovered that a patch applied while the oven is hot will give better service than one applied while cold. For these reasons it is considered desirable to patch an oven while hot. After the patch is appliedit must be smoothed in order to enable the coke to be pushed out of the oven without snagging on the walls;

It is an object of thisinvention to provide apparatus for smoothing hot furnace walls.

This and other objects will be more apparent after referring to the following description and attached drawings in which:

Fig. l is a view showing the appartus in position for smoothing the walls of a coke oven.

Fig. 2 is a plan view taken on line 11-11 in Fig. 1.

Fig. 3 is an end view of the support for the grinding wheel of the invention.

. Figs. 4, 5 and 6, combined, show the grinder and extension therefor used in practicing the invention.

The invention will be described as applied to the repairing of the walls of the coking chamber of a coke oven, but it will be understood that it may be used in repairing or smoothing the hot walls of other types of furnaces.

' Referring more particularly to the drawings, reference numeral 2 indicates the discharge end of a coking chamber. The walls of this end of the chamber are often dug out by the coke as it is pushed out of the oven. The temperature of the chamber with the adjacent ovens in operation is about 1600 or 1700 F. To repair the hot walls a refractory is sprayed into the pockets in the wall. Several layers of the refractory are applied until the wall has been built up to slightly more than the desired thickness. The sprayed walls are rough and it is necessary to smooth them in order to enable the coke to be removed from the oven. This is done by grinding the walls as shown in Figs. 1 and 2. The grinding wheel 4 is driven by an air motor 6 having .an extension 8 connected thereto. This extension may be lengthened or shortened as required to enable the operator to manipulate the grinding wheel at various distances "from the end of the oven. A portable rail Ill supports a movable carriage H which may be constructed as desired. As disclosed it is formed from a plate I2 having brackets l4, l6 and I8 fastened thereto. Each of the brackets has a groove 29 for supporting the extension at various heights. The bottom of the plate I2 is fastened to a plate 22 which supports wheels 24 for movement on the rail l0. Reinforcing members 26 extend between the ends of plate 22 and a bent plate 28 fastened to the top of plate l2.

The operation is as follows: After the patch has been applied the rail i0 is put in the desired position and the carriage ll placed thereon. Preferably the outer end of the chamber is smoothed first. The grinder is placed with, the extension 8 resting in the desired groove 20 and the operator swings the wheel in an arc about the groove to grind the projections from the wall. The'air from the motor exhausts through the pipe 30 against the wheel to cool itand blow the dust away from the vicinity of the wheel in order to enable'the operator to see the work clearly. When the limit of movement of the wheel from one position is reached the extension 8 is moved to another bracket and a higher or lower section of the wall is ground. To work on a different longitudinal section of the wall, the grinder along with the carriage H is shoved longitudinally along the track l0. When the carriage ll reaches the end of the track In, the track is moved further into thefurnace. The above procedure is followed until the entire wall is smooth. To smooth the walls of the other end of the chamber the apparatus is taken to the pusher end of the furnace and the same operation is performed.

The details of the grinder used in smoothing the walls is illustrated in Fig. 4. An air motor 32 is enclosed in a water jacket 34. The motor shaft 36 is mounted in a bearing housing 38 attached to the motor. The motor drives the grinding wheel 4 through the shaft 36, bevel gears 40-42, and grinding wheel shaft 44 mounted in bearings 46 and 48. Bearing 48 is held down by means of a left hand threaded nut 50 which has an oil seal 52 and fits over the enlarged section 54 of the shaft 44. The wheel chuck 56 is fabricated steel construction and is machined after ..the chamber 116 an .14. flange. .8 I of. gear" Lboxj .12. TjOnLIthe .Tside of lithe r'n'otori toward; thegiifidin vlitariifold '82. to. which is Y the swivel .i'oiht towardthejgrinding wheel. I. The

jacket. in an extension 796..'.An1i'nlet'j.water...p p

ILI 2'jfor receiving a reinforcing. .tap'eredi portion; [16 'forleii agingwithga' corresponding taper .o nf'th"flangeilffl2. Spaced 'rings go 111.8 arefw elded toithe extensio "grinder-f rromjs1ipping' on the. '"otherend of the extension"96 isformdWith. two "threads in' the same manner; asithe. end i next to thetwaterjacket.""'The rear formed in" the samenmanner Thetwoisections', are fastens .therebf for receiving the corresponding'f threads welding to fit the sectional grinding wheel. The safety guard 58 is a machine steel slip ring which can be adjusted up or down by means of screws in the chuck wheel. Plate 60 is a retaining and clamping device for keeping the stone sections in place in the chuck and is held in place by screws 02. A nut 64 is screwed on the shaft 44 to'clamp the grinding wheel in place. A taper ring 66 is cut into four segments after machining. When the tapered nut 68 is screwed ontheishaft 44 it causesthe ring 66 to expand" the sectional stones out toward the chuck and at the same time hold down the whole assembled grinding unit against the shoulder onshaft 44.

A plate 70 separates the cooling water from the;.;;

lubricating grease in the gear box 12. A grease plug 14 is removed to apply greaseto the gear box 12. The gear box I2'has.atcoolingnwater chamber 16. The bottom 'or this chamber is covered by a plate I8 which is provided with a:'2

:removableplug. B for..drainingethehwater from dhprdviding. accesslto'fthe plug The. w'aterjjacket 34.,is'. conne'c'ted'l-to ."the

connectedjth. 1 ipejl84 which passes through. a conventional shilling box 186. T. The swivellj oint; B8. is fastened. to the. outer end. of the. l lipe 84 ..and. aL-pip"'30 exteridslfrom exhaust air is directedl'from. the pipe 3 0; against thegri-nding wheel'tolco'oliit arid ibl'ow dust. away "fronithe grinding wheeltolclear the jvi'sion ofithe .operatQr.

.An air. passage J92 .extendsgto.

34 andm'atches'1with Qan .air passageill l' extendsfromlthe ojiiteriend ofjtheljacketlu toithe water passage ..inithe. gear box. I'ZThe. waterffills the ,i'em'ai'ning portionsloi the T100, on'f the jacket 3411s .conne on'theextension 96. ITheflange I02 haslanjopen- I ing' .10 4. which 'leads' ,tothef water inlet" '98. Pasi sages I06 drainthe' heatedwater fromjthjacket (34. "The flange I02 isscrewfed. to: the1exterisio'ri 96 i by means. .bf pipe'fthrea'dsi I08.

"iThe' extension straightlgthreads nut"1l4 havin a has" atr'aised portion" 'I I O'Yhaving .96 Jto: prevent the support" ,I I. "'The d toget er, by means "of a couplingshown'iri Fig; 5. iAfsleeve "I2 2 having a hexhead I24 haspipethreads I'26,1on1 each end offse'ctions '96"a nd 120." Adj acentthe pipeithreads r lw zof'isectiomv I'203I1and thei Connecticut is reinforced "'bynut I32. The handlhead has a warm water drain I therein. To the outer side of the handle head, there is fastened a gland plate I42 glwhel ..is.jan. exhaust the requiredlength of exte the .end fofthe,.35

ja ket. xnahge cte'dto' anahgeinr T LiJiDefI 20.115

e eixtehsiozrfea' through 'said casing.

,-.,ha vi,ng-. two packing boxes I44 for receiving the 5z-szcompressed air pipe I46 andthe cooling water pipe I48. A section of pipe I is threaded into theflange flm and is connected to the compressed .air.pipe I.46 b means of coupling I52. A cool- "ing water pipe154 is threaded into the flange 0 I02 a1idis connected to the cooling pipe I48 by .meansof coupling I56. .Handleslfidare screwed into the handle head 13 6'. i It .willlbehnderstood that. additional sections of-pipe. may be inserted between the sections l96,and 1'20 ino'ider' .to, 'give rision.

The Ioperation .ofjfth'e grinder' is 7 as. follows: "After "the-zm'otjor has been assembled with. the extensions thereon; the. cooling. water. pipe "148 iSl connected to' aisourcefof water. Theiwater p30 ipassesthraugh the pipes I48 "and "i'54jth'rou'gh the passage' 1 n4 and; the --p.i pe 98 to; theicdoling water chamber" I6. and the space within? the 'Jjabket34. The warm; water passes outfthrough the passage 'ways, I061 "the exten'sionsf"96: and I20 and "is' discharged"'from'the "outlet I140. 2Com- ;pressed lair is supplied to "the". motor through "the pipes" I'4B1and'fI 5,0...ar1d passages? '94,.arid352. "The "exhaust" air. passes throughfthe; manifold :82; pipej84, 'swivelgjoint'; '8Byandg'pip'e :and is discharged againstfthe grinding wheel.

While ,one embofdiment ;of the invention has been-shown anddescribed; it will be. apparentthat other adaptationsjand'enibodiments may be made withoutdeparting from? the scope "of the. attached claims. I "claim 1 1:" A hot furnace grinder comprisizgga grinding wheel an. air rnotor": for rotating said jgrinding wheel, rneans f for l directing l the exhaust {Lair against. th e grinding'. wheel and; rneansior-lsupplying a co'olant to said niotor.

2. A hot furnace grinder comprisinga .lgrinding'whe'el, an air ,motorlfor ,rotating'said, grinding wheel, means for directing the le'xhaust air against; the g'rindingjwheel, pa. -housing ioizasaid motor, an'extension connected to saidlhciising, means on the.free end oflsaid.extensioiiiorl operating saidjgririderiirom; outsidegthelfurnaceiand .meaj :"for supplyingia lcofolan't to .Is'aidh rnotlor 'TQ-HAREES'RF me ger 

